The other issue related to a longer than optimal (for you) seat tube is the corresponding longer top tube on standard bike geometry. (Custom made is a different story.) You'll not only be stretched to the legs, but in the cockpit, too, in all likelihood. You can play around with steam length and handle bars, but you run into potentially destroying the handling characteristics and the deal becomes less sweet as you sink money into the compromises. At the end of the day, long term happiness is unlikely.